Ever notice A) how much glass has been favored by local developers/ architects in recent projects and B) how much said glass begins to look the same after oh, maybe five minutes or so? We're beginning to fear for the lives of San Francisco's avian population as more and more reflective surfaces create mass confusion on the city's skyline. Ouch. Are you blind as a bat or keen as a hawk? Take the Guess That Glass challenge: Identify the 6 individual buildings above after the jump, and we'll do a reveal at the end of the day. It's on!